MBRP Street 3in Quad Tip Cat Back Exhaust - 2015-2021 Subaru WRX / STI Subaru-STI-2018 The upper front control arm

The upper front control arm is responsible for defining rear wheel camber and toe under suspension movement -- two parameters that directly affect cornering grip and rear stability

Satisfies the gear oil viscosity requirements of 75W

as well as fully forged stroker rods and CP pistons

+35mm offset

The improvement under hard braking is real and measurable -- particularly noticeable at track days where braking zones are repeated consistently

MBRP Street 3in Quad Tip Cat Back Exhaust - 2015-2021 Subaru WRX / STI Subaru-STI-2018 The upper front control armThe 3 Inch Cat Back Exhaust System will improve the sound and the performance of the Subaru WRX STI. RallySport Direct carries a great selection of quality performance exhaust systems and exhaust components brought to you by MBRP. Here, you are looking at the MBRP 3 Inch Cat Back Exhaust System. This exhaust system features smooth mandrel bends that limit back pressure and turbulence. When combined with a larger piping diameter, you get an increase in